问题
解答题
解方程
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答案
①X÷0.05=3.528,
X÷0.05×0.05=3.528×0.05,
X=0.1764;
②2X-4×6=80,
2X-24=80,
2X-24+24=80+24,
2X=104,
2X÷2=104÷2,
X=52;
③4×4.5-3X=6.38,
18-3X=6.38,
18-3X+3X=6.38+3X,
6.38+3X=18,
6.38+3X-6.38=18-6.38,
3X=11.62,
3X÷3=11.62÷3,
X=
;581 150
④4X-7.2=10,
4X-7.2+7.2=10+7.2,
4X=17.2,
4X÷4=17.2÷4,
X=4.3;
⑤11.5X+X=20,
12.5X=20,
12.5X÷12.5=20÷12.5,
X=1.6;
⑥3.8×12+15X=87.6,
45.6+15X=87.6,
45.6+15X-45.6=87.6-45.6,
15X=42,
15X÷15=42÷15,
X=2.8.